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STOCKHOLDERS' EQUITY - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
numberofstocks
Mar. 31, 2014
Dec. 31, 2014
Class Of Stock [Line Items]      
Common stock, shares authorized 2,000,000,000us-gaap_CommonStockSharesAuthorized   2,000,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value $ 0.10us-gaap_CommonStockParOrStatedValuePerShare   $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares issued 214,618,015us-gaap_CommonStockSharesIssued   213,724,749us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 213,827,258us-gaap_CommonStockSharesOutstanding   212,984,700us-gaap_CommonStockSharesOutstanding
Granted shares of restricted stock 821,532us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross    
Corporation has authorized shares of preferred stock 50,000,000us-gaap_PreferredStockSharesAuthorized   50,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value $ 1us-gaap_PreferredStockParOrStatedValuePerShare    
Number of preferred stock series 5fbp_NumberOfPreferredStockSeries    
Stock repurchase plan treasury stock 790,757us-gaap_TreasuryStockNumberOfSharesHeld   740,049us-gaap_TreasuryStockNumberOfSharesHeld
Repurchased of common stock 50,708us-gaap_TreasuryStockSharesAcquired    
Liquidation value per share $ 25us-gaap_PreferredStockLiquidationPreference    
Legal surplus reserve amount $ 40.0fbp_LegalSurplusAmount    
Conversion Of Stock Shares Issued1   1,075,283us-gaap_ConversionOfStockSharesIssued1  
Shares Of Preferred Stock Exchanged   249,477fbp_SharesOfPreferredStockExchanged  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number     2,327,156us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Omnibus Plan [Member]      
Class Of Stock [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number 3,076,438us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ fbp_ShareBasedCompensationPlanNameAxis
= fbp_OmnibusPlanMember		    
Restricted Stock [Member]      
Class Of Stock [Line Items]      
Repurchased of common stock 22,525us-gaap_TreasuryStockSharesAcquired
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
FirstBank [Member]      
Class Of Stock [Line Items]      
Legal surplus reserve rate 10.00%fbp_LegalSurplusReserveRate
/ dei_LegalEntityAxis
= fbp_FirstbankMember		    
Original amount contributed in percentage 20.00%fbp_OriginalAmountContributedInPercentage
/ dei_LegalEntityAxis
= fbp_FirstbankMember		    
Series A Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage 7.125%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		    
Series B Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage 8.35%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Series C Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage 7.40%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		    
Series D Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage 7.25%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		    
Series E Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage 7.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember